Isn't it obvious? It feeds your ego when someone praises you, and since no one is, might as well praise yourself by yourself. It does yield results after all. What's a better way to attract readers than wish-fulfillment? Writing a good story? Why bother when you have a free-labor ticket?
That being said, I, SlaveOfTheLord, am the greatest person alive!!
See? Well, you can't see it, but I just inflated my ego to unreasonable heights and I have to tell you that it does feel gud, really gud! Oh! Did I also mention how I, SlaveOfTheLord, am the most humble person ever? No? Well, now you know it!
Jokes aside, the thing about Africa is a stereotype. When you tell someone about a country in Africa, what would their first thought be? Desert! I can tell you, from experience, that most people will immediately think of a backward place, nomads and of course a desert.
It also feels good when you know that you are better than some people, and that's where the stereotype comes into place.
That is all I have to say, pretty trivial stuff that everyone knows, but sometimes, you need to mention these obvious stuff for them to come to light.
The Greatest Person Alive